:root{
  --bg:#FFFFFF;
  --bg-soft:#F7FAFF;
  --bg-blue:#EDF5FF;
  --bg-gray:#F5F6F8;
  --title:#172033;
  --text:#3E4859;
  --muted:#6F7A89;
  --subtle:#98A1AF;
  --blue:#1478F2;
  --blue-bright:#2F8CFF;
  --blue-deep:#075DC9;
  --blue-dark:#084A9C;
  --blue-soft:#D9EAFE;
  --white:#FFFFFF;
  --border:rgba(20,120,242,.12);
  --border-gray:rgba(30,50,70,.08);
  --shadow:0 14px 38px rgba(21,67,118,.08);
  --shadow-blue:0 16px 42px rgba(20,120,242,.15);
  --button:linear-gradient(135deg,#3A96FF 0%,#1478F2 55%,#0863D3 100%);
  --footer:#0B1F38;
  --footer-text:#EAF3FF;
  --radius:18px;
  --max:1280px;
  --nav-h:74px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--text);font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",Arial,sans-serif;line-height:1.75;overflow-x:hidden}
body.ui-locked{overflow:hidden}
img{display:block;max-width:100%;height:auto}
a{color:inherit;text-decoration:none}
button,input{font:inherit}
button{color:inherit}
p{margin:0 0 1em}
h1,h2,h3,h4{margin:0;color:var(--title);line-height:1.25}
h1{font-size:clamp(2rem,4vw,4rem);letter-spacing:-.04em}
h2{font-size:clamp(1.45rem,2.4vw,2.25rem);letter-spacing:-.025em}
h3{font-size:1.08rem}
ul,ol{margin:0;padding-left:1.25rem}
.skip-link{position:fixed;left:12px;top:12px;transform:translateY(-150%);background:var(--blue);color:white;padding:10px 14px;border-radius:10px;z-index:3000}
.skip-link:focus{transform:none}
.site-header{position:sticky;top:0;z-index:1200;background:rgba(255,255,255,.96);border-bottom:1px solid var(--border-gray);backdrop-filter:blur(14px)}
.nav-shell{height:var(--nav-h);max-width:var(--max);margin:0 auto;padding:0 24px;display:grid;grid-template-columns:minmax(210px,1fr) auto minmax(230px,1fr);align-items:center;gap:18px}
.brand-link{min-width:0;display:flex;align-items:center;gap:10px;justify-self:start}
.brand-logo{max-width:154px;max-height:42px;object-fit:contain}
.brand-text{font-size:1.2rem;font-weight:800;color:var(--blue)}
.brand-tag{font-size:.75rem;color:var(--blue-dark);background:var(--bg-blue);padding:5px 9px;border-radius:999px;white-space:nowrap}
.primary-nav{display:flex;align-items:center;justify-content:center;gap:4px;white-space:nowrap}
.primary-nav a,.nav-action-link,.nav-icon-btn{min-height:44px;display:inline-flex;align-items:center;justify-content:center;border-radius:12px;padding:0 11px;font-size:.92rem;font-weight:650;transition:.2s ease}
.primary-nav a:hover,.primary-nav a.is-active,.nav-action-link:hover,.nav-action-link.is-active{color:var(--blue);background:var(--bg-blue)}
.nav-actions{justify-self:end;display:flex;align-items:center;gap:5px;white-space:nowrap}
.nav-icon-btn{border:1px solid var(--border);background:white;cursor:pointer}
.nav-icon-btn:hover{border-color:rgba(20,120,242,.28);color:var(--blue);background:var(--bg-soft)}
.mobile-nav{display:none}
.site-main{min-height:62vh}
.section{padding:72px 24px}
.section.soft{background:var(--bg-soft)}
.section.blue-soft{background:var(--bg-blue)}
.section.gray{background:var(--bg-gray)}
.container{width:min(100%,var(--max));margin:0 auto}
.eyebrow{display:inline-flex;align-items:center;gap:8px;margin-bottom:12px;color:var(--blue);font-size:.82rem;font-weight:800;letter-spacing:.04em}
.eyebrow:before{content:"";width:18px;height:4px;border-radius:99px;background:var(--blue)}
.lede{font-size:1.08rem;color:var(--muted);max-width:760px}
.section-head{display:flex;justify-content:space-between;align-items:end;gap:24px;margin-bottom:30px}
.section-head p{max-width:700px;color:var(--muted);margin:8px 0 0}
.text-link{display:inline-flex;align-items:center;min-height:44px;color:var(--blue);font-weight:750}
.text-link:after{content:"→";margin-left:7px}
.primary-button{display:inline-flex;min-height:46px;padding:0 20px;align-items:center;justify-content:center;background:var(--button);color:white;border-radius:13px;font-weight:800;box-shadow:var(--shadow-blue)}
.primary-button:hover{transform:translateY(-1px)}
.secondary-link{display:inline-flex;min-height:44px;align-items:center;color:var(--blue);font-weight:750}
.actions-row{display:flex;gap:16px;align-items:center;flex-wrap:wrap;margin-top:24px}
.card{background:white;border:1px solid var(--border-gray);border-radius:var(--radius);box-shadow:var(--shadow);padding:24px}
.card p:last-child{margin-bottom:0}
.tag{display:inline-flex;align-items:center;border-radius:999px;background:var(--bg-blue);color:var(--blue-dark);padding:4px 10px;font-size:.78rem;font-weight:720}
.mini-meta{display:flex;flex-wrap:wrap;gap:8px;margin:12px 0}
.grid-2{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:22px}
.grid-3{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:22px}
.grid-4{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:18px}
.topic-list{display:grid;gap:14px}
.topic-row{display:grid;grid-template-columns:minmax(190px,.7fr) minmax(0,1.5fr) auto;gap:22px;align-items:center;padding:20px 0;border-bottom:1px solid var(--border-gray)}
.topic-row:last-child{border-bottom:0}
.topic-row p{margin:0;color:var(--muted)}
.topic-row .text-link{white-space:nowrap}
.prose{max-width:820px}
.prose p{margin:0 0 1.2em}
.prose h2{margin:1.8em 0 .6em}
.prose h3{margin:1.3em 0 .45em}
.page-intro{padding:68px 24px 42px;background:linear-gradient(180deg,var(--bg-soft),white)}
.page-intro .container{display:grid;grid-template-columns:minmax(0,1.25fr) minmax(280px,.75fr);gap:40px;align-items:end}
.page-intro p{max-width:800px;color:var(--muted);font-size:1.05rem}
.intro-note{padding:20px;border:1px solid var(--border);border-radius:16px;background:var(--bg-blue);color:var(--blue-dark)}
.channel-strip{border-top:1px solid var(--border-gray);border-bottom:1px solid var(--border-gray);background:white}
.channel-strip .container{display:flex;gap:24px;align-items:center;overflow-x:auto;scrollbar-width:none;padding:0 24px}
.channel-strip .container::-webkit-scrollbar{display:none}
.channel-strip a{position:relative;display:flex;align-items:center;min-height:56px;white-space:nowrap;color:var(--muted);font-weight:700}
.channel-strip a:before{content:"";width:6px;height:6px;margin-right:8px;border-radius:50%;background:var(--blue)}
.channel-strip a:hover{color:var(--blue)}
.editorial-hero{padding:34px 24px 28px;background:var(--bg-soft)}
.editorial-grid{display:grid;grid-template-columns:minmax(0,.82fr) minmax(360px,1.4fr) minmax(0,.88fr);gap:20px;align-items:stretch}
.hero-copy,.hero-side,.hero-banner{background:white;border:1px solid var(--border-gray);border-radius:22px;box-shadow:var(--shadow);padding:28px}
.hero-copy h1{font-size:clamp(2.2rem,3.5vw,3.7rem)}
.hero-copy p{color:var(--muted);margin-top:18px}
.hero-banner{position:relative;display:flex;min-height:420px;align-items:center;justify-content:center;overflow:hidden;background:linear-gradient(145deg,#e7f2ff,#ffffff 48%,#dcecff)}
.hero-banner:before,.hero-banner:after{content:"";position:absolute;border-radius:50%;background:rgba(20,120,242,.09);pointer-events:none}
.hero-banner:before{width:260px;height:260px;right:-80px;top:-70px}
.hero-banner:after{width:170px;height:170px;left:-40px;bottom:-50px}
.hero-banner img{position:relative;z-index:1;max-height:390px;object-fit:contain;border-radius:16px}
.hero-banner-fallback{position:relative;z-index:1;text-align:center;color:var(--blue-dark)}
.hero-banner-fallback strong{display:block;font-size:2rem;color:var(--blue);margin-bottom:8px}
.hero-side{display:flex;flex-direction:column}
.hero-side h2{font-size:1.25rem;margin-bottom:15px}
.hero-entry{padding:15px 0;border-top:1px solid var(--border-gray)}
.hero-entry:first-of-type{border-top:0}
.hero-entry p{font-size:.92rem;color:var(--muted);margin:.4em 0}
.hero-entry a{color:var(--blue);font-size:.9rem;font-weight:750}
.overview-grid{display:grid;grid-template-columns:1.25fr .9fr 1.1fr .85fr;gap:16px}
.overview-item{padding:26px;border-radius:18px;background:white;border:1px solid var(--border-gray)}
.overview-item:nth-child(2),.overview-item:nth-child(4){background:var(--bg-blue)}
.overview-item p{color:var(--muted);margin:10px 0 0}
.discussion-layout{display:grid;grid-template-columns:minmax(0,1.15fr) minmax(0,.85fr);gap:24px}
.discussion-main{padding:32px;border-radius:22px;background:var(--blue);color:white;box-shadow:var(--shadow-blue)}
.discussion-main h2,.discussion-main h3{color:white}
.discussion-main p{color:rgba(255,255,255,.88)}
.discussion-list{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px}
.discussion-list article{padding:20px;border:1px solid var(--border);border-radius:16px;background:white}
.discussion-list p{color:var(--muted);font-size:.94rem}
.map-grid{display:grid;grid-template-columns:1.2fr .8fr 1fr;grid-auto-rows:minmax(165px,auto);gap:15px}
.map-card{position:relative;padding:24px;border-radius:20px;background:white;border:1px solid var(--border-gray);overflow:hidden}
.map-card:nth-child(1),.map-card:nth-child(5){grid-row:span 2;background:var(--bg-blue)}
.map-card:after{content:"";position:absolute;right:-32px;bottom:-34px;width:100px;height:100px;border-radius:50%;border:18px solid rgba(20,120,242,.06);pointer-events:none}
.life-mosaic{columns:3 260px;column-gap:18px}
.life-note{break-inside:avoid;margin:0 0 18px;padding:24px;border-radius:18px;background:white;border:1px solid var(--border-gray)}
.life-note:nth-child(3n+2){background:var(--bg-soft)}
.route-strip{display:grid;grid-template-columns:repeat(6,minmax(210px,1fr));gap:14px;overflow-x:auto;padding-bottom:8px}
.route-step{min-width:210px;padding:23px;border-radius:18px;background:white;border:1px solid var(--border)}
.route-no{width:32px;height:32px;display:grid;place-items:center;border-radius:50%;background:var(--blue);color:white;font-weight:800;margin-bottom:14px}
.interest-wall{display:flex;flex-wrap:wrap;gap:14px;align-items:stretch}
.interest-chip{flex:1 1 260px;min-width:220px;padding:22px;border:1px solid var(--border);border-radius:18px;background:white}
.interest-chip:nth-child(3n+2){flex-basis:340px;background:var(--bg-blue)}
.qa-index{display:grid;gap:12px}
.qa-item{display:grid;grid-template-columns:48px minmax(0,1fr);gap:18px;padding:24px 0;border-bottom:1px solid var(--border-gray)}
.qa-no{width:42px;height:42px;border-radius:14px;background:var(--bg-blue);display:grid;place-items:center;color:var(--blue);font-weight:900}
.story-list{display:grid;grid-template-columns:minmax(0,1.35fr) minmax(0,.65fr);gap:26px}
.story-main{padding:32px;border-left:4px solid var(--blue);background:var(--bg-soft);border-radius:0 18px 18px 0}
.story-stack{display:grid;gap:14px}
.story-stack article{padding:18px 0;border-bottom:1px solid var(--border-gray)}
.discovery-wall{columns:3 280px;column-gap:18px}
.discovery-item{break-inside:avoid;margin:0 0 18px;padding:22px;border-radius:18px;border:1px solid var(--border-gray);background:white}
.discovery-item:nth-child(4n+1){background:var(--bg-blue)}
.topic-feature{padding:34px;border-radius:22px;background:linear-gradient(135deg,#f7fbff,#e8f3ff);border:1px solid var(--border)}
.guide-list{counter-reset:guide;display:grid;gap:0}
.guide-entry{counter-increment:guide;display:grid;grid-template-columns:76px minmax(0,1fr) auto;gap:20px;padding:25px 0;border-bottom:1px solid var(--border-gray);align-items:start}
.guide-entry:before{content:counter(guide,decimal-leading-zero);font-size:1.4rem;font-weight:900;color:var(--blue)}
.principles-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px}
.principle{padding:24px;border-radius:18px;border-top:3px solid var(--blue);background:white;box-shadow:var(--shadow)}
.notice-list{display:grid;gap:0;border-top:1px solid var(--border-gray)}
.notice-item{display:grid;grid-template-columns:170px minmax(0,1fr);gap:26px;padding:24px 0;border-bottom:1px solid var(--border-gray)}
.notice-item .notice-type{color:var(--blue);font-weight:800}
.app-layout{display:grid;grid-template-columns:minmax(0,1fr) minmax(300px,.8fr);gap:38px;align-items:center}
.app-visual{min-height:420px;display:grid;place-items:center;padding:30px;background:var(--bg-blue);border-radius:28px;overflow:hidden}
.app-visual img{max-height:500px;object-fit:contain}
.app-fallback{text-align:center;color:var(--blue-dark)}
.service-quad{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px;margin:24px 0}
.service-quad div{padding:18px;border:1px solid var(--border);border-radius:14px;background:white}
.step-list{display:grid;gap:16px;counter-reset:step}
.step-card{counter-increment:step;display:grid;grid-template-columns:54px minmax(0,1fr);gap:18px;padding:22px;border-radius:16px;background:white;border:1px solid var(--border-gray)}
.step-card:before{content:counter(step);display:grid;place-items:center;width:42px;height:42px;border-radius:14px;background:var(--blue);color:white;font-weight:900}
.safety-split{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:22px}
.safety-panel{padding:30px;border-radius:22px;background:white;border:1px solid var(--border-gray)}
.safety-panel:first-child{transform:translateY(-12px);background:var(--bg-blue)}
.category-list{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:18px}
.category-item{padding:24px;border-left:3px solid var(--blue);background:var(--bg-soft);border-radius:0 16px 16px 0}
.rule-layout{display:grid;grid-template-columns:250px minmax(0,1fr);gap:34px;align-items:start}
.rule-nav{position:sticky;top:98px;padding:20px;border-radius:18px;background:var(--bg-soft);border:1px solid var(--border-gray)}
.rule-nav a{display:block;padding:8px 0;color:var(--muted)}
.rule-content section{padding:0 0 28px;margin-bottom:28px;border-bottom:1px solid var(--border-gray)}
.help-categories{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:16px}
.help-card{padding:22px;border-radius:18px;background:white;border:1px solid var(--border-gray)}
.faq-list{display:grid;gap:12px}
.faq-list details{border:1px solid var(--border-gray);border-radius:16px;background:white;padding:0 20px}
.faq-list summary{cursor:pointer;list-style:none;padding:20px 38px 20px 0;font-weight:800;color:var(--title);position:relative}
.faq-list summary::-webkit-details-marker{display:none}
.faq-list summary:after{content:"+";position:absolute;right:0;top:16px;font-size:1.5rem;color:var(--blue)}
.faq-list details[open] summary:after{content:"−"}
.faq-list details p{padding:0 0 20px;color:var(--muted)}
.feedback-flow{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:14px}
.feedback-flow article{padding:22px;background:var(--bg-soft);border-radius:16px}
.contact-lanes{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:18px}
.contact-lane{padding:26px;border-radius:18px;border:1px solid var(--border-gray)}
.brand-manifesto{padding:56px;border-radius:26px;background:var(--footer);color:var(--footer-text)}
.brand-manifesto h2{color:white}
.brand-manifesto p{max-width:900px;color:#d9e8fa}
.site-footer{background:var(--footer);color:var(--footer-text);padding:60px 24px 34px}
.footer-inner{width:min(100%,var(--max));margin:0 auto}
.footer-brand{max-width:720px;margin-bottom:36px}
.footer-brand-link{display:inline-flex;margin-bottom:14px}
.footer-logo{max-width:150px;max-height:46px;object-fit:contain}
.footer-brand-name{font-size:1.25rem;font-weight:900;color:white}
.footer-brand strong{display:block;color:white;font-size:1.25rem}
.footer-en{display:block;margin:3px 0 14px;color:#a8c8ef;font-size:.78rem;letter-spacing:.15em}
.footer-brand p,.footer-note{color:#bfd0e5}
.footer-links{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:28px;padding:28px 0;border-top:1px solid rgba(255,255,255,.11);border-bottom:1px solid rgba(255,255,255,.11)}
.footer-links h2{font-size:.95rem;color:white;margin-bottom:12px}
.footer-links a{display:block;color:#c8d9eb;padding:4px 0}
.footer-links a:hover{color:white}
.footer-note{max-width:900px;margin:24px 0 8px}
.copyright{color:#88a5c7;font-size:.85rem}
.mobile-bottom-nav{display:none}
.ui-overlay{position:fixed;inset:0;background:rgba(11,31,56,.34);z-index:1800;opacity:0;visibility:hidden;pointer-events:none;transition:.2s ease}
.ui-overlay.is-open{opacity:1;visibility:visible;pointer-events:auto}
.channel-panel,.search-panel{position:fixed;z-index:1900;left:0;right:0;top:var(--nav-h);background:white;box-shadow:0 24px 60px rgba(10,39,76,.17);visibility:hidden;pointer-events:none;opacity:0;transform:translateY(-12px);transition:.22s ease;max-height:calc(100vh - var(--nav-h));overflow:auto}
.channel-panel.is-open,.search-panel.is-open{visibility:visible;pointer-events:auto;opacity:1;transform:none}
.channel-panel{padding:30px max(24px,calc((100vw - var(--max))/2 + 24px)) 38px}
.panel-head{display:flex;justify-content:space-between;gap:20px;align-items:center;margin-bottom:22px}
.panel-close{min-width:72px;min-height:44px;border:1px solid var(--border);background:white;border-radius:12px;cursor:pointer}
.channel-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:26px}
.channel-grid h3{margin-bottom:12px}
.channel-grid a{display:block;padding:12px 0;border-top:1px solid var(--border-gray)}
.channel-grid a strong{display:block;color:var(--title)}
.channel-grid a span{display:block;color:var(--muted);font-size:.86rem;margin-top:3px}
.search-panel{padding:0;background:white}
.search-shell{width:min(100%,var(--max));margin:0 auto;padding:32px 24px 42px}
.search-label{display:block;font-weight:800;margin-bottom:8px}
.search-input{width:100%;min-height:54px;border:1px solid rgba(20,120,242,.26);border-radius:14px;padding:0 16px;outline:none}
.search-input:focus{border-color:var(--blue);box-shadow:0 0 0 4px rgba(20,120,242,.08)}
.search-hint{font-size:.88rem;color:var(--muted);margin:8px 0 22px}
.search-groups{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:24px}
.search-groups section{padding:20px;background:var(--bg-soft);border-radius:16px}
.search-groups h3{margin-bottom:9px}
.search-groups a{display:block;min-height:40px;padding:6px 0;color:var(--muted)}
.search-groups a:hover{color:var(--blue)}
.search-empty{padding:18px;background:var(--bg-blue);border-radius:14px;color:var(--blue-dark)}
:focus-visible{outline:3px solid rgba(20,120,242,.42);outline-offset:3px}
[hidden]{display:none!important}

/* 页面排版差异 */
.page-plaza .page-intro{background:linear-gradient(180deg,#edf5ff,#ffffff)}
.page-city .page-intro{background:linear-gradient(180deg,#f7fbff,#ffffff)}
.page-life .page-intro{background:linear-gradient(180deg,#ffffff,#f7faff)}
.page-travel .page-intro{background:linear-gradient(180deg,#edf5ff,#f9fcff)}
.page-interest .page-intro{background:linear-gradient(180deg,#f5f8ff,#ffffff)}
.page-questions .page-intro{background:linear-gradient(180deg,#f8fbff,#ffffff)}
.page-stories .page-intro{background:linear-gradient(180deg,#ffffff,#f5f7fa)}
.page-discover .page-intro{background:linear-gradient(180deg,#edf5ff,#ffffff)}
.page-topics .page-intro{background:linear-gradient(180deg,#f7fbff,#edf5ff)}
.page-guides .page-intro{background:linear-gradient(180deg,#ffffff,#f7faff)}
.page-community .page-intro,.page-rules .page-intro{background:linear-gradient(180deg,#edf5ff,#ffffff)}
.page-notices .page-intro{background:linear-gradient(180deg,#f5f6f8,#ffffff)}
.page-app .page-intro,.page-download .page-intro{background:linear-gradient(180deg,#eaf4ff,#ffffff)}
.page-safety .page-intro,.page-privacy .page-intro{background:linear-gradient(180deg,#edf5ff,#ffffff)}
.page-help .page-intro,.page-faq .page-intro{background:linear-gradient(180deg,#f7faff,#ffffff)}
.page-feedback .page-intro,.page-contact .page-intro{background:linear-gradient(180deg,#ffffff,#f7faff)}
.page-about .page-intro{background:linear-gradient(180deg,#edf5ff,#ffffff)}

@media (max-width:1120px){
  .nav-shell{grid-template-columns:auto 1fr auto;padding:0 16px}
  .brand-tag{display:none}
  .primary-nav{gap:1px}
  .primary-nav a,.nav-action-link,.nav-icon-btn{padding:0 8px;font-size:.86rem}
  .editorial-grid{grid-template-columns:1fr 1.2fr}
  .hero-side{grid-column:1/-1;display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:14px}
  .hero-side h2{grid-column:1/-1}
  .hero-entry{border:1px solid var(--border-gray);border-radius:14px;padding:15px}
  .overview-grid{grid-template-columns:repeat(2,1fr)}
  .principles-grid,.help-categories{grid-template-columns:repeat(2,minmax(0,1fr))}
}
@media (max-width:860px){
  :root{--nav-h:64px}
  .desktop-nav{display:none}
  .mobile-nav{height:var(--nav-h);display:grid;grid-template-columns:64px minmax(0,1fr) 64px;align-items:center;padding:0 10px}
  .mobile-brand{justify-self:center;min-width:0;display:flex;align-items:center;justify-content:center}
  .mobile-brand .brand-logo{max-width:138px;max-height:38px}
  .mobile-icon-btn{min-width:44px;min-height:44px;border:0;background:transparent;display:inline-flex;align-items:center;justify-content:center;border-radius:10px;font-weight:750;cursor:pointer}
  .site-main{padding-bottom:62px}
  .section{padding:54px 18px}
  .page-intro{padding:52px 18px 34px}
  .page-intro .container{grid-template-columns:1fr;gap:22px}
  .editorial-hero{padding:20px 18px}
  .editorial-grid{grid-template-columns:1fr}
  .hero-copy{order:1}
  .hero-banner{order:2;min-height:280px}
  .hero-side{order:3;display:grid;grid-template-columns:repeat(2,minmax(0,1fr))}
  .discussion-layout,.story-list,.app-layout,.safety-split,.rule-layout{grid-template-columns:1fr}
  .rule-nav{position:static}
  .grid-3,.grid-4,.principles-grid,.help-categories,.feedback-flow{grid-template-columns:repeat(2,minmax(0,1fr))}
  .map-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
  .map-card:nth-child(1),.map-card:nth-child(5){grid-row:auto}
  .category-list,.contact-lanes{grid-template-columns:1fr}
  .footer-links{grid-template-columns:repeat(2,minmax(0,1fr))}
  .mobile-bottom-nav{position:fixed;z-index:1100;left:0;right:0;bottom:0;display:grid;grid-template-columns:repeat(5,1fr);background:rgba(255,255,255,.98);border-top:1px solid var(--border-gray);padding-bottom:env(safe-area-inset-bottom)}
  .mobile-bottom-nav a{min-height:52px;display:flex;align-items:center;justify-content:center;font-size:.82rem;color:var(--muted);font-weight:750}
  .mobile-bottom-nav a.is-active{color:var(--blue);background:var(--bg-blue)}
  .site-footer{padding-bottom:calc(90px + env(safe-area-inset-bottom))}
  .channel-panel{top:0;left:auto;width:min(88vw,420px);height:100vh;max-height:none;padding:24px;transform:translateX(100%);overflow:auto}
  .channel-panel.is-open{transform:none}
  .channel-grid{grid-template-columns:1fr}
  .search-panel{top:0;height:100vh;max-height:none;overflow:auto;transform:translateY(-8px)}
  .search-groups{grid-template-columns:1fr}
}
@media (max-width:620px){
  .section{padding-left:15px;padding-right:15px}
  .page-intro{padding-left:15px;padding-right:15px}
  .editorial-hero{padding-left:15px;padding-right:15px}
  .channel-strip .container{padding:0 15px}
  .hero-copy,.hero-side,.hero-banner{padding:22px}
  .hero-side{grid-template-columns:1fr}
  .overview-grid,.grid-2,.grid-3,.grid-4,.discussion-list,.principles-grid,.help-categories,.feedback-flow,.service-quad,.map-grid{grid-template-columns:1fr}
  .topic-row{grid-template-columns:1fr;gap:6px}
  .guide-entry{grid-template-columns:54px minmax(0,1fr)}
  .guide-entry .text-link{grid-column:2}
  .notice-item{grid-template-columns:1fr;gap:6px}
  .footer-links{grid-template-columns:1fr 1fr;gap:20px}
  .brand-manifesto{padding:30px}
  .life-mosaic,.discovery-wall{columns:1}
  .section-head{align-items:start;flex-direction:column}
}
@media (prefers-reduced-motion:reduce){
  *,*:before,*:after{scroll-behavior:auto!important;transition:none!important;animation:none!important}
}